{
  "resourceType" : "Parameters",
  "id" : "cql-parameters-example",
  "meta" : {
    "profile" : ["http://hl7.org/fhir/uv/cql/StructureDefinition/cql-parameters"]
  },
  "parameter" : [{
    "extension" : [{
      "url" : "http://hl7.org/fhir/StructureDefinition/cqf-cqlType",
      "valueString" : "System.Boolean"
    }],
    "name" : "Is pregnancy confirmed",
    "_valueBoolean" : {
      "extension" : [{
        "url" : "http://hl7.org/fhir/StructureDefinition/data-absent-reason",
        "valueCode" : "unknown"
      }]
    }
  }]
}